SOLID STATE SCIENCES
·
2019
·
IF 2.155
Jianxun Zhao,Xiangjun Zhou,Yalan Guo,Zhongmin Su,Heng Liu,Wanqiang Liu,Shang Gao
Co 0.9 Cu 0.1 Si alloy was fabricated via mechanical alloying technique. Different amount of palladium was doped into the Co 0.9 Cu 0.1 Si alloy by ball milling. The composite alloy combined the excellent electrocatalysis activity of Pd, exhibiting preferable electrochemical performance than the original alloy. The Co 0.9 Cu 0.1 Si + 5 wt% Pd composite showed a C max of 559.2 mAh/g, significantly higher than that for Co 0.9 Cu 0.1 Si (502.1 mAh/g). The cycle stability was also enhanced after Pd loading. Moreover, the effect of ball milling time on electrochemical performance for the composite alloy was also investigated. 5 wt% Pd was mixed with the Co 0.9 Cu 0.1 Si alloy at different ball milling time (0.5 h, 1 h, 2 h, 3 h and 5 h). The optimal discharge capacity, capacity retention and high-rate dischargeability were obtained under the ball milling time of 2 h. The studies on electrochemical reaction kinetics demonstrated that the addition of Pd could accelerate the charge-transfer, thus enhancing the electrochemical activity and reaction kinetics of the alloy. The results indicated that Pd loading was an effective way in enhancing the electrochemical performance of Co 0.9 Cu 0.1 Si alloy.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2022
·
IF 4.52
Zhangfeng Zhao,Zhengwei Dai,Xuming Jiang,Liaoyuan Yu,Meijuan Hu,Jiyu Peng,Fei Zhou
Superfine grinding is a crucial step in green tea powder (GTP) processing. In this work, the time-resolved changes of physicochemical properties (physical properties, main active components, etc.) of GTPs were investigated, and ball milling time (BMT) for tea grinding was optimized. Variable importance in projection was used to evaluate the importance of modification of each physicochemical parameter on BMT, and a multi-objective fuzzy optimization model was used to obtain the optimal BMT. The BMT range was 2–30 h, and the results showed that BMT had a significant influence on the physicochemical properties of GTP. The mean particle size decreased from 257 to 10.6 μ m and the color became lighter as the BMT increased. The main active components decreased markedly when BMT increased form 18–24 h. Mean particle size and color difference dramatically correlated with BMT and could be described by a one-phase exponential decay function. The optimal BMT was 18 h and high quality GTP could be obtained under this condition with small particle size, bright green color and rich in theanine and total tea polyphenols (TTPs).
研究领域:
食品科学
·
茶叶加工
✓ 已验证
产品关联
DOI
高影响因子
SOLID STATE IONICS
·
2025
·
IF 3.3
Peng Xu,Haiwei Wu,Haiwen Li,Hanbin Liu,Zhijian Li
In recent years, with the continuous development of high-voltage cathode materials for lithium-ion (Li + ) batteries, the LiMn 1-X Fe X PO 4 solid solution obtained by using Mn element to replace part of Fe on the basis of LiFePO 4 (LFP) has received extensive attention. It shows significantly improved voltage and capacity than LFP, which is currently regarded as a leading update for the traditional LFP cathode. At present, preparation of high-performance LiMn 1-X Fe X PO 4 using common high-temperature solid-state method is still challenging and the basic intricate coupling of the Mn-Fe ratio and ball milling time parameters on its electrochemical performance is still need to be fully studied due to the parametric complexity. Herein, the carbon wrapped LiMn 1-X Fe X PO 4 /C material was prepared by high-temperature solid-phase method, and paper-based LiMn 1-X Fe X PO 4 /C electrodes were also fabricated to fully study the synergistic effects of ball milling times (0.5 h, 1 h, 2 h) and Mn-Fe ratios (5:5, 6:4, 7:3, 8:2) on their electrochemical performance. It was found that there happened to be optimized ball milling time for each Mn-Fe ratio based LiMn 1-X Fe X PO 4 /C materials. The higher Mn-Fe ratio, the longer ball milling time that is needed to achieve high electrochemical performance of paper-based LiMn 1-X Fe X PO 4 /C cathodes. Through detailed analysis of cyclic voltammetry (CV) curves, cycling and rate performance, it was found that LiMn 1-X Fe X PO 4 /C cathode prepared by ball milling for 1 h and Mn-Fe ratio of 7:3 has the best optimized voltage, cycling and rate performance.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Haiman Xu,Rongzhen Liu,Chonggao Bao,Na Huang,Pan Li,Hao Li
Aluminum nitride (AlN) ceramics are widely utilized in various applications due to their exceptional properties. However, fabricating complex AlN components using conventional machining techniques remains challenging. To address this issue, Digital Light Processing (DLP) is proposed as a viable technique for manufacturing intricate AlN ceramics. A key challenge in this process is the moisture absorption and hydrolysis of AlN powders, which significantly increase slurry viscosity and affect the layer-by-layer accumulation of AlN slurry. This study systematically investigated the particle size distribution, rheological behavior, and curing kinetics of AlN slurry processed with different ball-milling times. At a ball-milling time of 8 h, the slurry with a 54 vol% solid loading exhibited a viscosity of 21.1 Pa.s at a shear rate of 27 s −1 and a curing depth of 83 μm at an energy dose of 74.4 mJ/cm². Following debinding and sintering, the sintered AlN ceramics achieved a flexural strength of 98.7 MPa, a bulk density of 2.74 g/cm³ , and an open porosity of 12.82 %. These findings provide critical insights into optimizing slurry preparation and processing parameters for the DLP-based fabrication of AlN ceramics.
研究领域:
材料科学
·
陶瓷加工
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2020
·
IF 2.779
Feng Tian,Cong Chen,Qiang Liu,Roman Yavetskiy,Maxim Ivanov,Stanislav Balabanov,Yagang Feng,Xin Liu,Ziyu Liu,Dianjun Hu,Zhaoxiang Yang,Tengfei Xie,Jiang Li
Nd:YAG transparent ceramics were obtained by vacuum sintering from nanopowders synthesized by co-precipitation method. The co-precipitated powder was optimized by studying calcination temperature (from 800 to 1300 °C) of the precursor and ball-milling time (from 0 to 24 h). Influences of calcination temperature and ball-milling time on comprehensive properties of nanopowders were studied in detail. Influences of sintering conditions (sintering temperature and holding time) on transmittance and microstructure were also investigated. The conclusions based on a comprehensive study of the whole ceramics processing from the powders synthesis to Nd:YAG ceramics sintering. The co-precipitated powder calcined at 1250 °C with ball-milling for 12 h demonstrates relatively better comprehensive properties. The 1.0 at% Nd:YAG ceramic sample with the thickness of 1.3 mm sintered at 1775 °C for 20 h has the highest in-line transmittance of 76.0% at 1064 nm.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
Green Processing and Synthesis
·
2020
·Vol. 9
·期 1
·650-663
·
IF 1.672
Wanwan Wang,Jibao Cai,Zhenyu Xu,Yi Zhang,Fanchao Niu,Miao Gao,Jun Yang
A method was developed for rapid qualitative determination of lignocellulose in the tobacco cell wall by utilizing 2D heteronuclear single quantum coherence NMR spectra (2D HSQC NMR). Traditional methods for analyzing the structure of lignocellulose involve many steps of separation and extraction, which is labor-intensive. In this work, the whole cell wall was milled and dissolved in deuterium solvent. The solvent dimethylsulfoxide (DMSO-d 6 ) containing hexamethylphosphoramide (HMPA-d 18 ) enhanced swelling of the sample and gave high-resolution spectra. The tobacco samples are ball milled at different ball milling times, and the state of the particles is observed through an electron microscope, and then the probability of the particles being less than 5 µm is counted. Through the comparison of the abundance and integration of the peak signals in the spectra under different transmittances, it was determined that when the milling time was 6 h, the quality of the NMR spectra was the best. The optimum conditions of characterizing tobacco structure were DMSO-d 6 /HMPA-d 18 solution and 6 h milling time. Under these conditions, complete representation of the structure of lignocellulose and simplified process could be achieved. Graphical abstract
研究领域:
植物学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 12
·4397
·
IF 3.4
Siyuan Yang,Fei Wang,Zhe Zhang,Zhiming Liu,Jiliang Zhang,Kaiyong Jiang
Electromagnetic (EM) wave absorption performance is greatly affected by the microscopic morphology of the absorbing material particles. In this study, a facile and efficient ball-milling method was applied to increase the aspect ratio of particles and prepare flaky carbonyl iron powders (F-CIPs), one of the most readily commercially available absorbing materials. The effect of ball-milling time and rotation speed on the absorption behaviors of the F-CIPs was investigated. The microstructures and compositions of the F-CIPs were determined using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The EM parameters were measured using a vector network analyzer (VNA) in the frequency range of 2–18 GHz. The results indicated that the ball-milled flaky CIPs exhibited a better absorption ability than the raw spherical CIPs. Among all the samples, the sample milled at 200 r/min for 12 h and the sample milled at 300 r/min for 8 h showed remarkable EM parameters. The ball-milling sample with 50 wt.% F-CIPs had a minimum reflection loss peak of −14.04 dB at a thickness of 2 mm and a maximum bandwidth (RL < −7 dB) of 8.43 GHz at a thickness of 2.5 mm, a result that conformed with the transmission line theory. Hence, the ball-milled flaky CIPs were considered to be beneficial for microwave absorption.Keywords:carbonyl iron powders;absorption performance;ball-milling time;ball-milling rotation speed;electromagnetic parameters
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOLID STATE SCIENCES
·
2020
·
IF 2.434
Jian Lv,Qingran Wang,Peng Chen,Heng Liu,Zhongmin Su,Jianxun Zhao,Wanqiang Liu,Jianhua Hou,Shang Gao
The Co 2 B alloy is synthesized by high temperature solid phase process. 5 wt% Pd is added to the Co 2 B alloy by ball milling at different milling time in order to enhance discharge performance of the raw alloy. The phase structure and surface morphology of these alloys is characterized by XRD and SEM. The discharge capacities of the alloy milled for 10 min and 30 min are higher than that of the raw alloy. However, the discharge capacity of the alloy milled for 1 h is lower than that of the raw alloy. The result of linear polarization and EIS shows that proper milling time and uniform distribution of palladium on the alloy surface can make the alloy electrode have excellent discharge capacity. Ball milling at appropriate time can make the palladium on the alloy surface uniformly distributed and the alloy particles do not aggregate, which increases the charge-transfer reaction rate and discharge capacity. The experimental results prove that the addition of palladium and proper ball milling can effectively improve the electrochemical hydrogen storage capacity of the Co 2 B alloy.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Hui Yun,Jing Bai,Zhiheng He,Huanxi Wang,Yanhong Wang,Shijie Cao,Santosh Kumar Verma,Quanquan Li
MgCo alloys are considered important hydrogen storage materials, yet it depends on the synthetic methods (alloying, nanosizing, catalyst modification, etc ) to a certain degree. Thus, investigation of the effect of synthetic conditions on the dynamics/thermodynamic properties of MgCo alloys is a crux. Herein, we fabricated Mg10Co alloy via a combination of mechanical alloying and high-temperature/pressure hydrogenation to explore the effect of alloying time on the hydrogenation and dehydrogenation performances of Mg10Co. The Mg10Co consists of Mg, Mg 2 Co, MgCo 2 , and Co phase, providing nucleation sites for heterogeneous nucleation of hydrides, and the grain refinement can increase surface defects, shorten the diffusion and transport distance of hydrogen. In addition, the ball milling time significantly affected the hydrogenation performance, and the best performance was achieved with the ball milling time being 14 h, and Mg10Co can absorb 5.93 wt% of H 2 in 5 min at 350 °C. The high hydrogen absorption rate can perhaps due to the lower absorption plateau of Mg 2 CoH 5 and Mg 6 Co 2 H 11 hydrides relative to MgH 2 . Furthermore, the dehydrogenation activation energy was 124.89 kJ/mol. This work contributes to the improvement of the kinetics properties of magnesium-based hydrogen storage alloys.
研究领域:
材料科学
·
能源储存
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Guannan Chen,Lv Zhu,Mingyuan Liu,Cong Wei,Chunming Zhou,Tianyuan Zhou,Cen Shao,Jian Kang,Wieslaw Strek,Hao Chen,Le Zhang
Transparent ceramic fiber is the appealing material for fiber laser gain media. Currently, the presence of micro-pore defects and poor optical quality in hundred-micron ceramic fibers greatly limits their application in fiber lasers. In this paper, high optical quality YAG (Y 3 Al 5 O 12 ) ceramic fibers were prepared by optimizing the ball milling time of slurry, and revealed that dispersion behavior of slurry was crucial to prepare good microstructure and defect-free green body and ceramic fibers. The excellent optical and mechanical properties of transparent ceramic fibers were obtained with the ball milling time of 25 h for slurry and sintering at 1780 °C for 8 h for ceramics. The transmittance of YAG ceramics (2 mm thick) at 800 nm of 82.6 % and a high flexural strength of 1124 ± 86 MPa could be observed. However, the longer ball milling time would thicken the slurry and deteriorate the uniformity slurry. This optimized processing technology of gelcasting could promote the quality of hundred-micron sized ceramics fibers.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2019
·
IF 2.781
Lei Wang,Chuyang Liu,Guoyue Xu,Shanshan Xiang,Mengyu Shi,Yujing Zhang
CeO 2 powders with flaky morphology and high floating rate are fabricated successfully by ball-milling and stearic acid modification. The influences of ball-milling time and surfactant stearic acid content on the morphology, floating rate, infrared emissivity of CeO 2 powders as well as the CeO 2 /epoxy-silicone coatings have been investigated systematically. The results show that the CeO 2 powders transform from irregular grains with larger size to flake grains with smaller size by ball-milling for 4 h. The floating rate of CeO 2 enhances from 0 cm 2 /g to 89.06 cm 2 /g by increasing stearic acid content from 0 wt% to 1 wt% while diminishes to 60.477 cm 2 /g with stearic acid content of 3 wt%. Ultimately, the coating with CeO 2 fillers ball-milled by 4 h and modified by 1 wt% of stearic acid exhibits the lowest emissivity value of 0.831 in the 8–14 μm waveband. The mechanisms for small and flaky fillers as well as high floating fillers to achieve low emissivity coatings are also fully revealed.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 4
·046532
·
IF 1.449
Chen Chen,Binxu Lan,Kang Liu,Hongbo Wang,Yuxin Deng,Yufei Zuo,Xiaohan Xu,Cheng Chen,Zhen Chen,Ping Luo,Shijie Dong
Herein, we prepared Al–Bi–NaCl composites by mechanical ball milling and investigated the effects of ball milling time on their hydrogen production performance, additionally analyzing energy conversion during ball milling. Subsequently, the effects of Bi and NaCl content and initial temperature on hydrogen production performance were studied. Moreover, the phase, morphology, and elemental composition of these composites and by-products of their hydrolysis were studied by a range of instrumental techniques. An optimal hydrogen yield of 1140 ml g−1 (in 1 h) was obtained at a milling time of 4 h, and the results of instrumental characterization showed that no new phase was formed during ball milling (i.e., Al, Bi, and NaCl were only mechanically mixed) and that the constituent elements were evenly distributed in the composite. Hydrolysis by-products were identified as porous Al(OH)3 and AlO(OH), that is, Bi did not participate in the reaction.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）